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This tire size calculator lets you check what you can replace your tires or wheels with without changing overall tire diameter or with some acceptable diameter change. The data presented here is in no way "official", please use common sense and check with manufacturer recommendations and other references.
Current Tire Size: (examples: 185/65-14, 205/75-15) How to link to this page?
Width: to Ratio: to Wheel (Rim Size): to
Max. Difference, %:
Best Matches for 185/60-15 in 15".
Code Width Ratio Wheel Diameter Wall," Wall,mm Diam.Diff. = 50mph 1000miles =
185/60-15 185 60 15 23.74 4.37 111.00 0.00% 50.00 1,000.00
315/35-15 315 35 15 23.68 4.34 110.25 -0.25% 49.88 1,002.49
245/45-15 245 45 15 23.68 4.34 110.25 -0.25% 49.88 1,002.49
275/40-15 275 40 15 23.66 4.33 110.00 -0.33% 49.83 1,003.32
225/50-15 225 50 15 23.86 4.43 112.50 +0.50% 50.25 995.02
205/55-15 205 55 15 23.88 4.44 112.75 +0.58% 50.29 994.20
145/75-15 145 75 15 23.56 4.28 108.75 -0.75% 49.63 1,007.46
155/70-15 155 70 15 23.54 4.27 108.50 -0.83% 49.59 1,008.29
325/35-15 325 35 15 23.96 4.48 113.75 +0.91% 50.46 990.88
175/65-15 175 65 15 23.96 4.48 113.75 +0.91% 50.46 990.88
285/40-15 285 40 15 23.98 4.49 114.00 +1.00% 50.50 990.05
215/50-15 215 50 15 23.46 4.23 107.50 -1.16% 49.42 1,011.61
255/45-15 255 45 15 24.04 4.52 114.75 +1.24% 50.62 987.56
195/55-15 195 55 15 23.44 4.22 107.25 -1.24% 49.38 1,012.44
165/65-15 165 65 15 23.44 4.22 107.25 -1.24% 49.38 1,012.44
305/35-15 305 35 15 23.41 4.20 106.75 -1.41% 49.30 1,014.10
165/70-15 165 70 15 24.09 4.55 115.50 +1.49% 50.75 985.07
265/40-15 265 40 15 23.35 4.17 106.00 -1.66% 49.17 1,016.58
155/75-15 155 75 15 24.15 4.58 116.25 +1.74% 50.87 982.59
235/45-15 235 45 15 23.33 4.16 105.75 -1.74% 49.13 1,017.41
175/60-15 175 60 15 23.27 4.13 105.00 -1.99% 49.00 1,019.90
195/60-15 195 60 15 24.21 4.61 117.00 +1.99% 51.00 980.10
"= 50mph" - true speed when speedometer shows 50mph
"1000miles =" - odometer reading for actual 1000 miles

Click on [Show] to open charts and add wheel sizes to the matches table.
Ratio: 30 35 40 45 50 55 60 65 70 75 80 85
Wheel Size 12" [Show] [Hide]
Wheel Size 13" [Show] [Hide]
Wheel Size 14" [Show] [Hide]
Wheel Size 15"  
145 145/30-15
d=18.43
w=1.71
-22.39% 		145/35-15
d=19.00
w=2.00
-19.98% 		145/40-15
d=19.57
w=2.28
-17.58% 		145/45-15
d=20.14
w=2.57
-15.17% 		145/50-15
d=20.71
w=2.85
-12.77% 		145/55-15
d=21.28
w=3.14
-10.36% 		145/60-15
d=21.85
w=3.43
-7.96% 		145/65-15
d=22.42
w=3.71
-5.56% 		145/70-15
d=22.99
w=4.00
-3.15% 		145/75-15
d=23.56
w=4.28
-0.75%
155 155/30-15
d=18.66
w=1.83
-21.39% 		155/35-15
d=19.27
w=2.14
-18.82% 		155/40-15
d=19.88
w=2.44
-16.25% 		155/45-15
d=20.49
w=2.75
-13.68% 		155/50-15
d=21.10
w=3.05
-11.11% 		155/55-15
d=21.71
w=3.36
-8.54% 		155/60-15
d=22.32
w=3.66
-5.97% 		155/65-15
d=22.93
w=3.97
-3.40% 		155/70-15
d=23.54
w=4.27
-0.83% 		155/75-15
d=24.15
w=4.58
+1.74%
165 165/30-15
d=18.90
w=1.95
-20.40% 		165/35-15
d=19.55
w=2.27
-17.66% 		165/40-15
d=20.20
w=2.60
-14.93% 		165/45-15
d=20.85
w=2.92
-12.19% 		165/50-15
d=21.50
w=3.25
-9.45% 		165/55-15
d=22.15
w=3.57
-6.72% 		165/60-15
d=22.80
w=3.90
-3.98% 		165/65-15
d=23.44
w=4.22
-1.24% 		165/70-15
d=24.09
w=4.55
+1.49% 		165/75-15
d=24.74
w=4.87
+4.23%
175 175/30-15
d=19.13
w=2.07
-19.40% 		175/35-15
d=19.82
w=2.41
-16.50% 		175/40-15
d=20.51
w=2.76
-13.60% 		175/45-15
d=21.20
w=3.10
-10.70% 		175/50-15
d=21.89
w=3.44
-7.79% 		175/55-15
d=22.58
w=3.79
-4.89% 		175/60-15
d=23.27
w=4.13
-1.99% 		175/65-15
d=23.96
w=4.48
+0.91% 		175/70-15
d=24.65
w=4.82
+3.81% 		175/75-15
d=25.33
w=5.17
+6.72%
185 185/30-15
d=19.37
w=2.19
-18.41% 		185/35-15
d=20.10
w=2.55
-15.34% 		185/40-15
d=20.83
w=2.91
-12.27% 		185/45-15
d=21.56
w=3.28
-9.20% 		185/50-15
d=22.28
w=3.64
-6.14% 		185/55-15
d=23.01
w=4.01
-3.07% 		185/60-15
d=23.74
w=4.37
0.00% 		185/65-15
d=24.47
w=4.73
+3.07% 		185/70-15
d=25.20
w=5.10
+6.14% 		185/75-15
d=25.93
w=5.46
+9.20%
195 195/30-15
d=19.61
w=2.30
-17.41% 		195/35-15
d=20.37
w=2.69
-14.18% 		195/40-15
d=21.14
w=3.07
-10.95% 		195/45-15
d=21.91
w=3.45
-7.71% 		195/50-15
d=22.68
w=3.84
-4.48% 		195/55-15
d=23.44
w=4.22
-1.24% 		195/60-15
d=24.21
w=4.61
+1.99% 		195/65-15
d=24.98
w=4.99
+5.22% 		195/70-15
d=25.75
w=5.37
+8.46% 		195/75-15
d=26.52
w=5.76
+11.69%
205 205/30-15
d=19.84
w=2.42
-16.42% 		205/35-15
d=20.65
w=2.82
-13.02% 		205/40-15
d=21.46
w=3.23
-9.62% 		205/45-15
d=22.26
w=3.63
-6.22% 		205/50-15
d=23.07
w=4.04
-2.82% 		205/55-15
d=23.88
w=4.44
+0.58% 		205/60-15
d=24.69
w=4.84
+3.98% 		205/65-15
d=25.49
w=5.25
+7.38% 		205/70-15
d=26.30
w=5.65
+10.78% 		205/75-15
d=27.11
w=6.05
+14.18%
215 215/30-15
d=20.08
w=2.54
-15.42% 		215/35-15
d=20.93
w=2.96
-11.86% 		215/40-15
d=21.77
w=3.39
-8.29% 		215/45-15
d=22.62
w=3.81
-4.73% 		215/50-15
d=23.46
w=4.23
-1.16% 		215/55-15
d=24.31
w=4.66
+2.40% 		215/60-15
d=25.16
w=5.08
+5.97% 		215/65-15
d=26.00
w=5.50
+9.54% 		215/70-15
d=26.85
w=5.93
+13.10% 		215/75-15
d=27.70
w=6.35
+16.67%
225 225/30-15
d=20.31
w=2.66
-14.43% 		225/35-15
d=21.20
w=3.10
-10.70% 		225/40-15
d=22.09
w=3.54
-6.97% 		225/45-15
d=22.97
w=3.99
-3.23% 		225/50-15
d=23.86
w=4.43
+0.50% 		225/55-15
d=24.74
w=4.87
+4.23% 		225/60-15
d=25.63
w=5.31
+7.96% 		225/65-15
d=26.52
w=5.76
+11.69% 		225/70-15
d=27.40
w=6.20
+15.42% 		225/75-15
d=28.29
w=6.64
+19.15%
235 235/30-15
d=20.55
w=2.78
-13.43% 		235/35-15
d=21.48
w=3.24
-9.54% 		235/40-15
d=22.40
w=3.70
-5.64% 		235/45-15
d=23.33
w=4.16
-1.74% 		235/50-15
d=24.25
w=4.63
+2.16% 		235/55-15
d=25.18
w=5.09
+6.05% 		235/60-15
d=26.10
w=5.55
+9.95% 		235/65-15
d=27.03
w=6.01
+13.85% 		235/70-15
d=27.95
w=6.48
+17.74% 		235/75-15
d=28.88
w=6.94
+21.64%
245 245/30-15
d=20.79
w=2.89
-12.44% 		245/35-15
d=21.75
w=3.38
-8.37% 		245/40-15
d=22.72
w=3.86
-4.31% 		245/45-15
d=23.68
w=4.34
-0.25% 		245/50-15
d=24.65
w=4.82
+3.81% 		245/55-15
d=25.61
w=5.31
+7.88% 		245/60-15
d=26.57
w=5.79
+11.94% 		245/65-15
d=27.54
w=6.27
+16.00% 		245/70-15
d=28.50
w=6.75
+20.07% 		245/75-15
d=29.47
w=7.23
+24.13%
255 255/30-15
d=21.02
w=3.01
-11.44% 		255/35-15
d=22.03
w=3.51
-7.21% 		255/40-15
d=23.03
w=4.02
-2.99% 		255/45-15
d=24.04
w=4.52
+1.24% 		255/50-15
d=25.04
w=5.02
+5.47% 		255/55-15
d=26.04
w=5.52
+9.70% 		255/60-15
d=27.05
w=6.02
+13.93% 		255/65-15
d=28.05
w=6.53
+18.16% 		255/70-15
d=29.06
w=7.03
+22.39% 		255/75-15
d=30.06
w=7.53
+26.62%
265 265/30-15
d=21.26
w=3.13
-10.45% 		265/35-15
d=22.30
w=3.65
-6.05% 		265/40-15
d=23.35
w=4.17
-1.66% 		265/45-15
d=24.39
w=4.69
+2.74% 		265/50-15
d=25.43
w=5.22
+7.13% 		265/55-15
d=26.48
w=5.74
+11.53% 		265/60-15
d=27.52
w=6.26
+15.92% 		265/65-15
d=28.56
w=6.78
+20.32% 		265/70-15
d=29.61
w=7.30
+24.71% 		265/75-15
d=30.65
w=7.82
+29.10%
275 275/30-15
d=21.50
w=3.25
-9.45% 		275/35-15
d=22.58
w=3.79
-4.89% 		275/40-15
d=23.66
w=4.33
-0.33% 		275/45-15
d=24.74
w=4.87
+4.23% 		275/50-15
d=25.83
w=5.41
+8.79% 		275/55-15
d=26.91
w=5.95
+13.35% 		275/60-15
d=27.99
w=6.50
+17.91% 		275/65-15
d=29.07
w=7.04
+22.47% 		275/70-15
d=30.16
w=7.58
+27.03% 		275/75-15
d=31.24
w=8.12
+31.59%
285 285/30-15
d=21.73
w=3.37
-8.46% 		285/35-15
d=22.85
w=3.93
-3.73% 		285/40-15
d=23.98
w=4.49
+1.00% 		285/45-15
d=25.10
w=5.05
+5.72% 		285/50-15
d=26.22
w=5.61
+10.45% 		285/55-15
d=27.34
w=6.17
+15.17% 		285/60-15
d=28.46
w=6.73
+19.90% 		285/65-15
d=29.59
w=7.29
+24.63% 		285/70-15
d=30.71
w=7.85
+29.35% 		285/75-15
d=31.83
w=8.42
+34.08%
295 295/30-15
d=21.97
w=3.48
-7.46% 		295/35-15
d=23.13
w=4.06
-2.57% 		295/40-15
d=24.29
w=4.65
+2.32% 		295/45-15
d=25.45
w=5.23
+7.21% 		295/50-15
d=26.61
w=5.81
+12.11% 		295/55-15
d=27.78
w=6.39
+17.00% 		295/60-15
d=28.94
w=6.97
+21.89% 		295/65-15
d=30.10
w=7.55
+26.78% 		295/70-15
d=31.26
w=8.13
+31.67% 		295/75-15
d=32.42
w=8.71
+36.57%
305 305/30-15
d=22.20
w=3.60
-6.47% 		305/35-15
d=23.41
w=4.20
-1.41% 		305/40-15
d=24.61
w=4.80
+3.65% 		305/45-15
d=25.81
w=5.40
+8.71% 		305/50-15
d=27.01
w=6.00
+13.76% 		305/55-15
d=28.21
w=6.60
+18.82% 		305/60-15
d=29.41
w=7.20
+23.88% 		305/65-15
d=30.61
w=7.81
+28.94% 		305/70-15
d=31.81
w=8.41
+34.00% 		305/75-15
d=33.01
w=9.01
+39.05%
315 315/30-15
d=22.44
w=3.72
-5.47% 		315/35-15
d=23.68
w=4.34
-0.25% 		315/40-15
d=24.92
w=4.96
+4.98% 		315/45-15
d=26.16
w=5.58
+10.20% 		315/50-15
d=27.40
w=6.20
+15.42% 		315/55-15
d=28.64
w=6.82
+20.65% 		315/60-15
d=29.88
w=7.44
+25.87% 		315/65-15
d=31.12
w=8.06
+31.09% 		315/70-15
d=32.36
w=8.68
+36.32% 		315/75-15
d=33.60
w=9.30
+41.54%
325 325/30-15
d=22.68
w=3.84
-4.48% 		325/35-15
d=23.96
w=4.48
+0.91% 		325/40-15
d=25.24
w=5.12
+6.30% 		325/45-15
d=26.52
w=5.76
+11.69% 		325/50-15
d=27.80
w=6.40
+17.08% 		325/55-15
d=29.07
w=7.04
+22.47% 		325/60-15
d=30.35
w=7.68
+27.86% 		325/65-15
d=31.63
w=8.32
+33.25% 		325/70-15
d=32.91
w=8.96
+38.64% 		325/75-15
d=34.19
w=9.60
+44.03%
Wheel Size 16" [Show] [Hide]
Wheel Size 16.5" [Show] [Hide]
Wheel Size 17" [Show] [Hide]
Wheel Size 18" [Show] [Hide]
Wheel Size 19" [Show] [Hide]
Wheel Size 20" [Show] [Hide]
Wheel Size 21" [Show] [Hide]

Thanx:
   Mark Sink's tire calculator -- for the idea and reference numbers
   Tirerack.com -- for quick and reliable service
   Mike.S -- for inspiration :)
   XAO::Web -- for bells and whistles that allowed to create this page in about an hour
The Tire Rack - Performance Specialists
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